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Old 04-19-2010, 06:44 AM   #1
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As most of you know, the Freightliners are rather noisy, so as a PhD in acoustics, you know it has driven me nuts. I have a new acoustics manufacture that does vehicle dampening as well. If anyone is interested, I will log the progress as well as the good and the bad. So far all I have done is take the interior out of the cab. The dash is next. I am installing three different types of acoustic dampeners.
1) sound barrier on the floor and fire wall
2) vibration dampeners on the doors
3) sound absorption inside of the dash

I'll post some pictures if it all works. My company does acoustic control for buildings, so this is kind of new to me.

Doc Weaver
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Old 04-19-2010, 06:58 AM   #2
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Souns Dyn-O-Mat!
oops I mean Dyn-O-Mite!

if you roll on dyno-mat, just wash all the steel down real good with soap and water, then a quick wipe with rubbing alcohol, and the surface is reay to roll on the dynomat. you should use a small 1" roller to press it into all the grooves and corners. We put 2 layers on the floor of my GMC 6500. and 1 layer on the door panels. it took 2 guys 4-5 hours to roll it all down.
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Old 04-19-2010, 10:25 AM   #3
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According to the numbers, the products I am using have almost twice the dampening power of Dynamat. Dynamat is, for the most part, a vibration dampener. I am using three different types of product from the same company. This company has been used on the Trick My Truck show.

This is the first time I have used this company, but from the discussions I have had with the head designers, they know acoustics and they know their product. We shall soon see.

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Old 04-19-2010, 05:34 PM   #4
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Sounds cool to me. I put a nice am/fm/cd player in my cab. Then I wired in two headphone jacks. I wear some nice Sony headphones with the leather/foam earcups that are good about sealing against my fat head and sealing out cab noise. Works great for listening to MPR while cruising. I've got tinted side windows in the cab and I sit back in the seat. So, if I spot a cop car I think I can rip the headphones off before they can spot me wearing them. And, I don't wear them around town, just on the highway where I'm mostly sitting in the right lane anyhow, except when passing other campers that is, hahaaahahah.
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Old 04-19-2010, 06:01 PM   #5
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I've got one door done. The heat gun is paramount. This stuff is fairly sturdy, but when heat is applied, it softens right up. Instead of butylene, it is made of strange vinyl. The idea is that once it cools to the shape of the door, it is stronger and controls any vibration. It is a good concept. Testing will be after the rest is complete.

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Old 04-19-2010, 09:47 PM   #6
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Doc,
Please tell us the name of the company you are using.

I have some experience with "Sound-Down" on a previous RV insulating the dog house. They are mostly "Boat People" but did a good job coaching me on that project.

Rad
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Old 04-20-2010, 01:49 PM   #7
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The company is CAE. I contacted them for commercial, but they do car, truck, home theater, and boats too.

The driver door is done, and now I have the dash apart. I'm starting to understand how all of these products are supposed to work. Their theory is sound (forgive the pun). It should work well.

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Old 04-22-2010, 05:22 PM   #8
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I've got the acoustic control installed. The first impression is a 12 db drop on the highway. The road noise and wind noise are greatly reduced. The engine noise is still leaking through a few places. I'm looking into fixes for them. Overall I am pleased with results. We no longer need to yell while on the highway.

I tried to post pics, but it didn't take. If I can get the pics up, I will explain what we did.

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Old 04-29-2010, 09:14 AM   #9
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I found a loud spot between the door and the side of the dash. Apparently the door doesn't seal very well. I put weather stripping on the door, but I haven't had time to test yet.

The other thing I found was a hollow body piece of the body that fits between the side of the hood and the door. It seems to catch motor noise and funnel it to the front door jamb (the same place that I put weather stripping). I'm looking into foam bagging that piece of the body.

ideas are welcome.

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Old 04-29-2010, 12:01 PM   #10
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By foam bagging do you mean expansive iceynene spray foam? If it is a hollow cavity, iceynene would work well, G
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